Abstract
Even a single data bit fault in an encryption or decryption circuit can spread quickly, and result in a totally scrambled output. Furthermore, deliberately injecting faults into a cryptographic device and observing the corresponding outputs can help an attacker gain access to the secret key. For these reasons, fault detection is needed in cryptography. We start this chapter with a brief overview of symmetric key and public key cryptography, and describe the fault injection attacks that can be mounted against them. We then present techniques that can be used to detect the injected faults in an attempt to foil such attacks.
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